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Research Papers

Shock Wave Propagation and Spallation Study in Laser Shock Peening

[+] Author and Article Information
Yunfeng Cao

Center for Laser-Based Manufacturing, School of Mechanical Engineering, Purdue University, West Lafayette, IN 47907

Yung C. Shin

Center for Laser-Based Manufacturing, School of Mechanical Engineering, Purdue University, West Lafayette, IN 47907shin@ecn.purdue.edu

J. Eng. Mater. Technol 132(4), 041005 (Sep 29, 2010) (8 pages) doi:10.1115/1.4002048 History: Received January 23, 2010; Revised June 10, 2010; Published September 29, 2010; Online September 29, 2010

This paper deals with the spallation induced by shock wave propagation in targets during the laser shock peening process. Physical aspects concerning laser-matter interaction, shock wave propagation, and spallation are considered. A continuous kinetic model for the spallation process is included in a one-dimensional finite-difference hydrodynamic code using Lagrangian coordinates in order to calculate the laser-induced spallation phenomena. Shock wave propagation in solids is calculated and validated by experimental data. The spallation zone location is then calculated for various materials with different thickness of foils and various laser shock peening parameters. The numerical simulations are compared with previously reported experimental results and good agreement is obtained for the spallation threshold and damage zone location.

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Copyright © 2010 by American Society of Mechanical Engineers
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Figures

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Figure 1

Scheme of laser spallation with water confinement (5)

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Figure 2

SEM observation of a cohesive rupture into Hastelloy X coated with diffused Pt and irradiated on the opposite surface with an intensity of 0.8 TW/cm2(6)

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Figure 3

Major energy transport processes related to confined plasma in LSP (2)

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Figure 4

Plasma pressure history for laser shock peening (laser wavelength 532 nm, FWHM 6 ns, and 50 μm black paint)

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Figure 5

Scheme of shock wave propagation in two different media

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Figure 6

(a) Scheme of shock compression of aluminum bar and (b) pressure input

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Figure 7

Comparison of simulation results and experimental data (21) for shock compression of aluminum (ρ0=2705 kg/m3,  γ=1.678,  c=5386 m/s): (a) shock velocity, (b) shock density, and (c) particle velocity

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Figure 8

Comparison between experimental data (9) and simulation results (250 μm Al foil, Gaussian pressure wave, Pmax=2.0 GPa, and pulse duration 25 ns)

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Figure 9

Comparison between experimental data (10) and simulation results (150 μm Cu foil, Gaussian pressure wave, Pmax=4.3 GPa, pulse duration 25 ns)

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Figure 10

Pressure pulse history (Laser pulse duration 10 ns, wavelength 1064 nm, and power density 1.1 GW/cm2)

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Figure 11

Calculated stress history at Cu/Ni interface

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Figure 12

Comparison of experimental and simulation results on voids distribution (250 μm Al foil, Gaussian pressure wave, Pmax=2.8 GPa, and pulse duration 25 ns): (a) simulation of voids distribution and (b) metallographical analysis of 250 μm Al foil (10)

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Figure 13

Comparison of experimental and simulation results on voids distribution (Cu/Ni system, Gaussian pressure wave, Pmax=1.4 GPa, and pulse duration 10 ns): (a) experiment results after shock loading (11) and (b) simulated void distribution in the depth direction

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Figure 14

Comparison of experimental and simulation results on voids distribution (Cu/Ni system, Gaussian pressure wave, Pmax=3.7 GPa, and pulse duration 10 ns): (a) experiment results after shock loading (11) and (b) simulated void distribution in the depth direction

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